chore: add security

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+# Security Policy
+
+## Supported Versions
+
+This is the list of versions of Vue Router which are
+currently being supported with security updates.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 4.0.x   | :white_check_mark: |
+| 3.5.x   | :white_check_mark: |
+| < 3.5.x | :x:                |
+
+## Reporting a Vulnerability
+
+To report a vulnerability please send an email with the details to security@vuejs.org. 
+This will help us to assess the risk and start the necessary steps. More information
+can be found in [Vue Documentation](https://vuejs.org/v2/guide/security.html#Reporting-Vulnerabilities).
+
+Thanks for helping to keep Vue Router secure.